Title: New Insight into Cosmology and the Galaxy-Halo Connection from Satellite Kinematics
Speaker: Frank van den Bosch (Yale)
Abstract:
In our LCDM paradigm, galaxies form and reside in dark matter halos. Establishing the (statistical) relation between galaxies and dark matter halos, the `Galaxy-Halo connection', therefore gives important insight into galaxy formation, and also is a gateway to using the distribution of galaxies to constrain cosmological parameters. After a brief introduction to how clustering and gravitational lensing can be used to constrain the galaxy-halo connection, I highlight some of the results that have been obtained over the years, which point to a tension with the Planck cosmology. After discussing the potential impact of assembly bias and baryonic effects, I present satellite kinematics as a complementary and competitive method to simultaneously constrain cosmology and the galaxy-halo connection, free of halo assembly bias issues. I show how this drastically improves our knowledge of the galaxy-halo connection without any signs of tension with the Planck cosmology.